* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  background-color: #000000b9;
  height: 80px;
  text-align: center;
  line-height: 80px;
  font-size: 32px;
  color: white;
}

.main {
  background-color: blue;
  overflow: hidden;
  flex: 1;
  display: flex;
  flex-direction: row;
}

.main nav {
  background-color: cadetblue;
  float: left;
  width: 206px;
}

.main .content {
  background-color: antiquewhite;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.clearfixed::after {
  content: "";
  height: 0;
  display: block;
  clear: both;
  visibility: hidden;
}

.main img {
  width: 580px;
  border-radius: 10px;
}

.content button {
  margin-top: 20px;
  margin-right: 20px;
  padding: 5px;
}

footer {
  height: 40px;
  background: gray;
  text-align: center;
  line-height: 40px;
}